37 citations · 117 across the 13 of their papers we have counts for
14 papers
Particle trapping in vortex crystals
Jean-Régis Angilella, S. Ravichandran
We study the motion of inertial particles in two-dimensional inviscid and viscous vortex crystals, where vortices are placed at the tips of a regular polygon, and determine the con…
Nonlocal flow sampling enables vortex trapping of heavy particles
Sachin Kulkarni, Sumithra R. Yerasi, Vishwanath Kadaba Puttanna +3
Most analyses of inertial particle motion in vortical flows rely on the point-particle approximation, in which the fluid velocity is assumed to be linear at the scale of the partic…
Irregular dependence on Stokes number and non-ergodic transport of heavy inertial particles in steady laminar flows
Anu V. S. Nath, Anubhab Roy, S. Ravichandran +1
Small heavy particles in a fluid flow respond to the flow on a time-scale proportional to their inertia, or Stokes number St. Their behaviour is thought to be gradually modified as…
Prograde and meandering wall modes in rotating Rayleigh-Bénard convection with conducting walls
S. Ravichandran, J. S. Wettlaufer
We use direct numerical simulations to study convection in rotating Rayleigh-Bénard convection in horizontally confined geometries of a given aspect ratio, with the walls held at f…
Orientation dynamics of two-dimensional concavo-convex bodies
S. Ravichandran, J. S. Wettlaufer
We study the orientation dynamics of two-dimensional concavo-convex solid bodies more dense than the fluid through which they fall under gravity. We show that the orientation dynam…
The waltz of tiny droplets and the flow they live in
S. Ravichandran, Rama Govindarajan
This article describes the dynamics of small inertial particles centrifuging out of a single vortex. It shows the importance of caustics formation in the vicinity of a single vorte…
Transport of condensing droplets in Taylor-Green vortex flow in the presence of thermal noise
Anu V. S. Nath, Anubhab Roy, Rama Govindarajan +1
We study the role of phase change and thermal noise in particle transport in turbulent flows. We employ a toy model to extract the main physics: condensing droplets are modelled as…
Direct numerical simulation of a moist cough flow using Eulerian approximation for liquid droplets
Rohit Singhal, S. Ravichandran, Sourabh S. Diwan
The COVID-19 pandemic has inspired several studies on the fluid dynamics of respiratory events. Here, we propose a computational approach in which respiratory droplets are coarse-g…
Entrainment in dry and moist thermals
G. R. Vybhav, S. Ravichandran
We study entrainment in dry thermals in neutrally and unstably stratified ambients, and moist thermals in dry-neutrally stratified ambients using direct numerical simulations (DNS)…
Non-Precipitating Shallow Cumulus Clouds: Theory and Direct Numerical Simulation
S. Ravichandran, Roddam Narasimha
We model cumulus clouds as transient diabatic plumes, and present a single-fluid formulation for the study of the dynamics of developing shallow cumulus clouds. The fluid, air, car…
Understanding droplet collisions through a model flow: Insights from a Burgers vortex
Lokahith Agasthya, Jason R. Picardo, S. Ravichandran +2
We investigate the role of intense vortical structures, similar to those in a turbulent flow, in enhancing collisions (and coalescences) which lead to the formation of large aggreg…
Dynamics of circular arrangements of vorticity in two dimensions
Rohith V. Swaminathan, S. Ravichandran, Prasad Perlekar +1
The merger of two like-signed vortices is a well-studied problem, but in a turbulent flow, we may often have more than two like-signed vortices interacting. We study the merger of…
Caustics and clustering in the vicinity of a vortex
S. Ravichandran, Rama Govindarajan
We study the formation of caustics in vortex-dominated \flows. We \find that only particles starting within a critical distance of a vortex which scales as the square roots of the…
Attracting fixed points for heavy particles in the vicinity of a vortex pair
S. Ravichandran, Prasad Perlekar, Rama Govindarajan
We study the behaviour of heavy inertial particles in the flow field of two like-signed vortices. In a frame co-rotating with the two vortices, we find that stable fixed points exi…